Allergie: Relative Vehicular Localization with Commodity RFID System

Abstract

In this paper, we present, Allergie, an off-the-shelf passive RFID based relative vehicular localization system. Allergie can differentiate four possible directions (i.e., from front to rear at left, from rear to front at left, from front to rear at right and from rear to front at right), where the nearby vehicles can approach. Allergie can tell the four possible directions by analyzing the spatial-temporal dynamics in the phase profiles extracted from the commodity passive RFID tags attached on the vehicles, when the nearby vehicle approaches. To do so, we extract the reflections from the nearby vehicle by cancelling out the reflections from the tags and the other objects. Allergie neither requires the dedicated infrastructure nor special hardware attached on the nearby vehicles to achieve relative localization. We do extensive experiments to evaluate the performance of Allergie in the real world under different weather conditions. The results show that Allergie can differentiate four possible directions, when the nearby vehicle approaches.